scope

问题 I send the variable newUser from options.html to background.html with chrome.extension.getBackgroundPage() like this document.getElementById("save").addEventListener( "click", function () { var newUser = document.getElementById("getEmail").value; var bkg = chrome.extension.getBackgroundPage(); bkg.saveNewUser(newUser); console.log("newUser " + newUser); } , false) In background.html I have function saveNewUser (newUser) { newUser = newUser; //this should be global? console.log("newUser from

问题 I want to loop through an array to perform $http.jsonp requests in angular, however each request will be slightly different depending on the timestamp of the previous $http.jsonp request. I'm trying to loop through 5 requests and each request is dependent on the previous request info. How can I perform a foreach loop that waits for each $http request to finish so that the "lastTime" variable is updated properly for the next $http request in the loop? Here's my code: var lastTime = null;

问题 This question is more on javascript principle. function done(){ console.log('done defined with `function done(){ ...`'); } var done = function(){ console.log('done defined with `var done = ...`'); } done = function(){ console.log('without `var`, just `done = ...`'); } If defined right inside <script> tags, will they all do the same thing, right? But if I place them in a closure (function(){ function definintion goes here }()) will any of these three types override either the globally defined

问题 As noted in this blog post you can set the scope of this in an anonymous function in Javascript. Is there a more elegant way of scoping this in the anonymous function call on success of the AJAX request (i.e. not using that )? For example: var Foo = { bar: function(id) { var that = this; $.ajax({ url: "www.somedomain.com/ajax_handler", success: function(data) { that._updateDiv(id, data); } }); }, _updateDiv: function(id, data) { $(id).innerHTML = data; } }; var foo = new Foo; foo.bar('mydiv')

问题 I investigated that scope of global variables in python is limited to the module. But I need the scope to be global among different modules. Is there such a thing? I played around __builtin__ but no luck. thanks in advance! 回答1: You can access global variables from other modules by importing them explicitly. In module foo : joe = 5 In module bar : from foo import joe print joe Note that this isn't recommended, though. It's much better to hide access to a module's variables by using functions.

问题 I can't get the $_POST['name'] values sent from an html form on my php file. I've seen lots of similar questions but nothing helped. I have lot's of includes so I believe it's a scope issue, but I can't figure it out. index.php print_r($_POST); //Returns nothing, tried other ways too //lot's of variables being defined include 'sql_data_handlers.php'; //instantiating some things sql_data_handlers.php //some functions retrieving data from sql db and finally: include($DOCUMENT_ROOT . "page.html"

问题 This is probably easy but I am confused as hell with environments. I would like to use a call to a function to assign a value to a variable, but I need to be able to use that variable after the call. However, I assume, the variable created by the function only exist within the function environment. In short, I need something akin to a global variable (but I am a beginner with R). The following code : assignvalue = function(varname){ assign(varname,1) } assignvalue("test") test returns Error:

问题 Normally, to create a closure, you create it inside another function, and it gets the scope of its parent: var parent = function(){ var a = "works!"; var subfunction(){ console.log(a); // "works!" } subfunction(); } I'm trying to figure out a way to emulate this closure behavior with a function that is defined outside of the parent function. I know this is possible using parameters: var parent = function(){ var a = "hello"; subfunction(a); } var subfunction(a){ console.log(a); // works, but

问题 I'm a beginning programmer (no experience) learning Visual Basic for a job I'm doing right now. I've been reading for a day or so and have finally decided to start making the required program! However, I'm running into some problems. Right now I have two subroutines. The first subroutine lets the user input how many data pairs they have so that I can create a table for them to fill in. This is so their data is in the right place for me to reference it later. There is then a button they press

问题 Can someone clarify the my understanding of variable scope within event handlers? Take a look at the code below: var address = new Array(); address[0] = '1 Smith Street'; address[1] = '2 Smith Street'; for(var rownum=0; rownum<=address.length; rownum++) { if(address[rownum]) geocoder.geocode( {'address': address[rownum]}, geocodeCallBack); } function geocodeCallBack(results, status) { var marker = new google.maps.Marker({ map: map, position: results[0].geometry.location, title: results[0]